A method to improve flowering rate and fruit quality of longan based on accumulative growth degree days in growth period

Abstract

The invention discloses a CGDD (Cumulative Growing Degree-Days) based method for improving the longan florescence rate and the fruit quality through flower forcing. The CGDD based method is established on the basis of the years of practical experience, a growing period and GDD (Growing Degree-Days) based innovative flower forcing technology is innovatively and systematically utilized, and the reasonable timing young sprout forcing, flower forcing and fruit setting is guided. The GDD are used for reflecting the accumulated heat of every growing period of longan trees under the actual environmental conditions and accordingly the flower forcing benefit of the GDD is remarkable and the accuracy is high. The expected accuracy of the expected effect of every growing period, namely the young sprout forcing period, the flower forcing period, the fruit setting period and fruit growing period, is within the range of plus or minus 5% through the CGDD. According to the CGDD based longan chemical flower forcing method, flower buds can be effectively induced, the physiological photosynthetic effect can be enhanced, the flowering and fruit setting of the longan trees can be promoted in a warm climate, the market sales production of logan fresh fruits is significantly improved, the fruiting can be achieved ahead of time, and high production economic returns can be obtained. According to the CGDD based longan flower forcing and management matching technology, the sustainable production of longan under the climate warming environmental conditions can be promoted.

Description

technical field [0001] The invention relates to a method for cultivating fruit trees, in particular to a method for improving the flowering and fruit setting rate and fruit quality of longan trees based on the cumulative growth degree days of the growth period. Background technique [0002] Longan (Dimocarpus longan) is one of the main tropical fruits. Wild longan is a common tree species in the semi-evergreen monsoon forest in the low mountains and hills of southwestern Hainan. Effect of longan tree on temperature, CO 2 , Nutrients and water environment changes are very sensitive, the average annual temperature of its distribution area is 22-26 ℃, and the annual precipitation is 900-1700 mm. Longan likes a dry and hot habitat, requiring low temperature and appropriate drought in winter and spring, and high temperature and abundant rainfall in the growth period between summer and autumn. Longan tree has 3 flower types: male flower, female flower and hermaphrodite flower. ...

AI Technical Summary

Problems solved by technology

However, the chemical reaction product of this kind of flower catalyst is a kind of dissolved salt (KCl, NaCl), which is easy to burn the leaves, leading to premature leaf fall during the flowering or fruit setting stage, affecting the photosynthesis of the tree and the nutrient generation of organic matter

Recently, the technology of flower urging has also been developed to apply chemical agents to the roots for flower urging, but due to the lack of optimization information, the fruit growers overdosed the dose (the dose per tree> 2kg), and the flower bud induction effect of the chemical agent is vulnerable to the climate (such as hurricane storms) Therefore, the actual application effect is uneven, and the flowering period is not flourishing

Because of the poor income, many longan fruit farmers (such as in Hainan Province) choose to cut down trees and plant other crops

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